Taxonomy of Quaternary Deep‐sea Ostracods From the Western North Atlantic Ocean

Yasuhara, Moriaki; Okahashi, Hisayo; Cronin, Thomas M.

doi:10.1111/j.1475-4983.2009.00888.x

Cited by 58 publications

(60 citation statements)

References 66 publications

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“…Their calcareous shells are abundantly preserved, and both taxa have a rich fossil record accessible though deep-sea coring (e.g., Thomas and Gooday 1996;Cronin and Raymo 1997;Wollenburg et al 2007;Yasuhara et al 2008bYasuhara et al , 2009a. Ostracods and foraminifera span similar size ranges, and in the deep sea, they are thought to exploit the same food source-particulate organic matter that sinks from shallower depths (Gooday 1994(Gooday , 2003bDidié and Bauch 2002;Cronin and Dwyer 2003;Schellenberg 2007;Yasuhara and Cronin 2008).…”

Section: Introductionmentioning

confidence: 99%

Climatic forcing of Quaternary deep-sea benthic communities in the North Pacific Ocean

Yasuhara¹,

Hunt²,

Cronin³

et al. 2012

Paleobiology

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There is growing evidence that changes in deep-sea benthic ecosystems are modulated by climate changes, but most evidence to date comes from the North Atlantic Ocean. Here we analyze new ostracod and published foraminiferal records for the last 250,000 years on Shatsky Rise in the North Pacific Ocean. Using linear models, we evaluate statistically the ability of environmental drivers (temperature, productivity, and seasonality of productivity) to predict changes in faunal diversity, abundance, and composition. These microfossil data show glacial-interglacial shifts in overall abundances and species diversities that are low during glacial intervals and high during interglacials. These patterns replicate those previously documented in the North Atlantic Ocean, suggesting that the climatic forcing of the deep-sea ecosystem is widespread, and possibly global in nature. However, these results also reveal differences with prior studies that probably reflect the isolated nature of Shatsky Rise as a remote oceanic plateau. Ostracod assemblages on Shatsky Rise are highly endemic but of low diversity, consistent with the limited dispersal potential of these animals. Benthic foraminifera, by contrast, have much greater dispersal ability and their assemblages at Shatsky Rise show diversities typical for deep-sea faunas in other regions. Statistical analyses also reveal ostracod-foraminferal differences in relationships between environmental drivers and biotic change. Rarefied diversity is best explained as a hump-shaped function of surface productivity in ostracods, but as having a weak and positive relationship with temperature in foraminifera. Abundance shows a positive relationship with both productivity and seasonality of productivity in foraminifera, and a hump-shaped relationship with productivity in ostracods. Finally, species composition in ostracods is influenced by both temperature and productivity, but only a temperature effect is evident in foraminifera. Though complex in detail, the global-scale link between deep-sea ecosystems and Quaternary climate changes underscores the importance of the interaction between the physical and biological components of paleoceanographical research for better understanding the history of the biosphere.

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Section: Introductionmentioning

confidence: 99%

Climatic forcing of Quaternary deep-sea benthic communities in the North Pacific Ocean

Yasuhara¹,

Hunt²,

Cronin³

et al. 2012

Paleobiology

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“…Surprisingly little attention has been given to understanding low-latitude deepsea diversity and the temporal dynamics of the LSDGs. Although pollen records suggest a persistent latitudinal diversity gradient existed in terrestrial ecosystems over the last 13,000 years (17, 18), we know of no studies of species-level temporal dynamics of LSDGs based on fossil assemblages from marine environments, despite the sensitivity of marine ecosystems to climatic change (12,13,(19)(20)(21)(22)(23)(24).The Ostracoda (Crustacea) are an important component of the deep-sea benthos (25)(26)(27), and the only commonly fossilized metazoan group in deep-sea sediments (12,13,28). Their various habitats and ecological preferences represent a wide range of deep-sea benthic niches, and their fossil record is considered representative of the benthic community (12,13,28).…”

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confidence: 99%

“…The Ostracoda (Crustacea) are an important component of the deep-sea benthos (25)(26)(27), and the only commonly fossilized metazoan group in deep-sea sediments (12,13,28). Their various habitats and ecological preferences represent a wide range of deep-sea benthic niches, and their fossil record is considered representative of the benthic community (12,13,28).…”

mentioning

confidence: 99%

Temporal latitudinal-gradient dynamics and tropical instability of deep-sea species diversity

Yasuhara

Hunt²,

Cronin³

et al. 2009

Proc. Natl. Acad. Sci. U.S.A.

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102

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A benthic microfaunal record from the equatorial Atlantic Ocean over the past four glacial-interglacial cycles was investigated to understand temporal dynamics of deep-sea latitudinal species diversity gradients (LSDGs). The results demonstrate unexpected instability and high amplitude fluctuations of species diversity in the tropical deep ocean that are correlated with orbital-scale oscillations in global climate: Species diversity is low during glacial and high during interglacial periods. This implies that climate severely influences deep-sea diversity, even at tropical latitudes, and that deep-sea LSDGs, while generally present for the last 36 million years, were weakened or absent during glacial periods. Temporally dynamic LSDGs and unstable tropical diversity require reconsideration of current ecological hypotheses about the generation and maintenance of biodiversity as they apply to the deep sea, and underscore the potential vulnerability and conservation importance of tropical deep-sea ecosystems.deep-sea Ostracoda ͉ global climate change ͉ latitudinal species diversity gradients ͉ macroecology ͉ Quaternary paleoceanography L atitudinal species diversity gradients (LSDGs), the patterns in which tropical regions contain more species than high latitudes, are one of the most basic ecological patterns on the earth (1). In the modern ocean, deep-sea bivalves, gastropods, isopods, cumaceans, and foraminifera all show strong LSDGs (2-6), and studies of benthic foraminifera assemblages indicate that the deep-sea gradients were established Ϸ36 million years ago (7). The environmental stability hypothesis holds that stability in tropical (1,8), and deep-sea (9, 10) environments might enhance species diversity, but there is now evidence for highly fluctuating high-latitude deep-sea diversity during Quaternary climatic cycles (11)(12)(13)(14)(15)(16). Surprisingly little attention has been given to understanding low-latitude deepsea diversity and the temporal dynamics of the LSDGs. Although pollen records suggest a persistent latitudinal diversity gradient existed in terrestrial ecosystems over the last 13,000 years (17, 18), we know of no studies of species-level temporal dynamics of LSDGs based on fossil assemblages from marine environments, despite the sensitivity of marine ecosystems to climatic change (12,13,(19)(20)(21)(22)(23)(24).The Ostracoda (Crustacea) are an important component of the deep-sea benthos (25)(26)(27), and the only commonly fossilized metazoan group in deep-sea sediments (12,13,28). Their various habitats and ecological preferences represent a wide range of deep-sea benthic niches, and their fossil record is considered representative of the benthic community (12,13,28). Furthermore, large (Ϸ130 m) glacial-interglacial sea-level changes (29), which drastically altered shallow-marine environments, had negligible effects on deep-sea habitats (e.g., Ͼ1,000 m water depth). Here, we examine low-latitude Quaternary records of deep-sea ostracods and temporal changes in LSDGs in the North Atlantic Oc...

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“…For example, Rosaliella is different from Cytheropteron by lacking ala and caudal process, although both genera have very similar hingement and subcentral muscle scars and some deep-sea Cytheropteron species lack ala (e.g. see Yasuhara et al, 2009, Yasuhara andOkahashi, 2015, for Cytheropteron). Some species of Eucytherura (e.g.…”

Section: Systematic Palaeontologymentioning

confidence: 99%

“…Some species of Eucytherura (e.g. Eucytherura pacifica Ayress, Whatley, Downing and Millson, 1995) have well-developed primary reticulation and pore clusters and very weakly developed caudal process similar to Rosaliella (Ayress et al, 1995;Yasuhara et al, 2009). However, Rosaliella differs from Eucytherura by lacking ridge, spine, and tubercle, and by having arched hingement (hingement is straight or sinuous in Eucytherura) and a comparatively less calcified shell (e.g.…”

Section: Systematic Palaeontologymentioning

confidence: 99%

Cold-seep ostracods from the western Svalbard margin: direct palaeo-indicator for methane seepage?

Yasuhara

Sztybor

Rasmussen

et al. 2018

J. Micropalaeontol.

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Abstract. Despite their high abundance and diversity, microfossil taxa adapted to a particular chemosynthetic environment have rarely been studied and are therefore poorly known. Here we report on an ostracod species, Rosaliella svalbardensis gen. et sp. nov., from a cold methane seep site at the western Svalbard margin, Fram Strait. The new species shows a distinct morphology, different from other eucytherurine ostracod genera. It has a marked similarity to Xylocythere, an ostracod genus known from chemosynthetic environments of wood falls and hydrothermal vents. Rosaliella svalbardensis is probably an endemic species or genus linked to methane seeps. We speculate that the surface ornamentation of pore clusters, secondary reticulation, and pit clusters may be related to ectosymbiosis with chemoautotrophic bacteria. This new discovery of specialized microfossil taxa is important because they can be used as an indicator species for past and present seep environments (http: //zoobank.org/urn:lsid:zoobank.org:pub:6075FF30-29D5-4DAB-9141-AE722CD3A69B).

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Taxonomy of Quaternary Deep‐sea Ostracods From the Western North Atlantic Ocean

Cited by 58 publications

References 66 publications

Climatic forcing of Quaternary deep-sea benthic communities in the North Pacific Ocean

Climatic forcing of Quaternary deep-sea benthic communities in the North Pacific Ocean

Temporal latitudinal-gradient dynamics and tropical instability of deep-sea species diversity

Cold-seep ostracods from the western Svalbard margin: direct palaeo-indicator for methane seepage?

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